/*
 Copyright  2007 MySQL AB, 2008 Sun Microsystems
 All rights reserved. Use is subject to license terms.

  The MySQL Connector/J is licensed under the terms of the GPL,
  like most MySQL Connectors. There are special exceptions to the
  terms and conditions of the GPL as it is applied to this software,
  see the FLOSS License Exception available on mysql.com.

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; version 2 of the
  License.

  This program is distributed in the hope that it will be useful,  
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  02110-1301 USA

 */

package com.mysql.jdbc;

import java.sql.SQLException;
import java.util.Properties;

public interface Extension {

	/**
	 * Called once per connection that wants to use the extension
	 * 
	 * The properties are the same ones passed in in the URL or arguments to
	 * Driver.connect() or DriverManager.getConnection().
	 * 
	 * @param conn the connection for which this extension is being created
	 * @param props configuration values as passed to the connection. Note that
	 * in order to support javax.sql.DataSources, configuration properties specific
	 * to an interceptor <strong>must</strong> be passed via setURL() on the
	 * DataSource. Extension properties are not exposed via 
	 * accessor/mutator methods on DataSources.
	 * 
	 * @throws SQLException should be thrown if the the Extension
	 * can not initialize itself.
	 */
	
	public abstract void init(Connection conn, Properties props) throws SQLException;
	
	/**
	 * Called by the driver when this extension should release any resources
	 * it is holding and cleanup internally before the connection is
	 * closed.
	 */
	public abstract void destroy();
}
